Resource exhaustion in OpenBSD OpenSSH
CVE-2015-5600
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.094 (95.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.094 · newest: 0.094 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
- Abdirisaq-ali-aynab/vulnerability-assessment
- ARPSyndicate/cve-scores
- Live-Hack-CVE/CVE-2015-5600
- Manjunath-Malagundla/itsecgames-assignment
- Maribel0370/Nebula-io
- ahm3dhany/IDS-Evasion
- bigb0x/CVE-2024-6387
- bigb0x/OpenSSH-Scanner
- edsonjt81/https-github.com-gotr00t0day-OpenSSH-Scanner
- kira99007/cyber-security-intern-at-ELEVATE
References
- www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- www.ubuntu.com/usn/USN-2710-2 (vendor-advisory)
- lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html (vendor-advisory)
- www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay
- www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- security.gentoo.org/glsa/201512-04 (vendor-advisory)
- kc.mcafee.com/corporate/index
Frequently asked questions
- What is CVE-2015-5600?
- CVE-2015-5600 is a high-severity vulnerability in OpenBSD OpenSSH, classified under CWE-264. CVSS score: 8.1/10. Published 2015-08-03.
- How severe is CVE-2015-5600?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2015-5600 known to be exploited?
- 21 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.